Grinder



L. WARZECHA.

v GRINDER. APPLICATION FILED MAR. 13, 1919.

Patented Mar. 8, 1921.

UNITED. STATES IUDWIK WARZECHA, OF BARNUM, MINNESOTA.

GRINDER.

Specification of Letters Patent.

Patented Mar. 8, 1921.

Application filed March 13, 1919. Serial No. 282,403.

T 0 all whom it may concern Be it known that I, LUDWIK WARZEGHA, a citizen of the United'States, and residing at Barnum, in the county of Carlton and State of Minnesota, have invented certain new and useful Improvements in Grinders, of which the following is a specification.

This invention relates to improvements in grinders, and particularly to portable types adapted to be hand operated.

The principal object of the invention is to provide a relatively light, easily operated structure which may be manipulated manually so as to produce the desired result on articles inaccessible to common means of power grinding.

A further object is to provide means com bined with the apparatus whereby the abrasive wheel is caused to rotate at a high rate of speed by the action of a powerful spring within the structure, means being also provided whereby a braking eifect may be obtained, the same acting to control the velocity of the wheel as it is rotated.

These and other like objects are attained by the novel construction and combination of parts hereinafter described, and shown in the accompanying drawings, forming a material part of this disclosure, and in which:-

Figure 1 is a side elevational view showing a grinder made in accordance with the invention.

Fig. 2 is a top plan View thereof, and

Fig. 3 is a vertical sectional view taken on line 3-3 of Fig. 2.

In carrying out the invention there is used a hollow metallic casing having an arcuately formed lower portion 10, adapted to be readily grasped in the hands of the operator, and by which the abrasive wheel may be directed at any desired point. The upper part of the structure, which is substantially rectangular in cross section, is provided with a cover 11, the same being engaged with the casing portion by means of bolts 12, provided with nuts 13, so that the cover may be removed whenever desirable while the sides of the casing are held together in a rigid manner by rivets 15 or like securing means.

A spindle is ournaled 1n the center of the arcuate portion of the casing, the same having a squared outer extending end 18, adapted to receive a wrench or key 19,.in the upper portion of the spindle through the opposite side of the casing.

Secured upon the front extending portion of the spindle, adjacent to the squared portion, is a ratchet disk 20, and engaging with its teeth is a pawl or detent 21, pivoted on the pin 22, set in one of the arms 23 of the wheel 24, which extends upward through an opening formed in the cover plate 12, the detent being held in engagement with the teeth of the ratchet by a spring 26.

Secured to the spindle, closely adjacent to the gear 24, is an inner end of a fiat spiral spring 28 of the clock type, its outer end being fixed upon a pin 29, set in the casing in such manner that when a key is attached to the square portion of the stem, the spring may be wound, that ratchet 20, clicking past the detent 21 in the usual manner of a clockwork mechanism.

Mounted on the top of the cover plate 12 is a bracket 30 in which is journaled the spindle 31, carrying a spur pinion 32, engageable with the teeth of the gear 24, so that rotary motion may be communicated to the spindle, which has also mounted, at the outer side of the casing, an abrasive wheel 33, which may be made of emery, corundum or like material.

From the foregoing it will be seen that when the spring is wound, that rotary motion is communicated to the grinding wheel, which upon proper manipulation of the casing, may be caused to perform effective work.

In order to control the speed of the grinding wheel, there is fixed upon the opposite end of the spindle on which the abrasive wheel is secured, a disk 35 and trained thereover is a thin flexible band 36, one end of which is secured a pin 37 set in the side of the casing, while the other end is attached to a lever 38, pivoted on a pin 39, the lever being provided with a detent 40, engageable with a rack segment 41, fixed on the side of the casing in such manner that when the handle of the lever is moved slightly outward, the detent may engage with the teeth in the rack, thereby increasing or diminishing the brake efiect of the band 36 upon the disk 35, thus controlling the speed of the abrading wheel.

Having thus described my invention what I claim as new, and desire to secure by Letters Patent, is

In a device of the character described, the combination of a casing with a shaft journaled therebetween and projecting laterally thereof, a pulley on said shaft, a pin in said casing arranged below said pulley, a pin alongside of said first named pin, a flexible metallic lever secured to the latter pin at one end thereof, said last named pin extendmg at a right angle to said casing, an arouate rack secured to said caslng, a" pm carried by said lever and adapted to engage said rack, said lever having a handle projecting beyond said rack and a flexible strap secured to the first named pin passing over said pulley and twisted at the opposite end so as to be secured to said lever, substantially as described and for the purpose'set forth.

In testimony whereof, I have signed my name to this specification in the presence of two subscribing witnesses, this 18th day of February, 1919.

LUDWIK WARZEOHA.

Witnesses:

F. E. BAUER, H. O. HANSON. 

